JPH08238684A - Tubular element - Google Patents

Abstract

PURPOSE: To provide the surface shape having a light weight and a high strength of various tubular element such as a beam tube in which a large bending force or a collapsing force is operated upon reception of a large deflection deformation. CONSTITUTION: The resin of the surface of a tubular element body formed by baking a prepreg in which reinforcing fiber 16 is impregnated or mixed with resin 18 is formed in the state to cover in an ultra-thin film state without almost exposing the fiber 16, and the region in which a filmlike resin surface 20 is formed in a finely rough surface state is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular body which is heated and fired with a prepreg using a thermosetting or thermoplastic resin. Therefore, it can be used for fishing rod tubes, golf club shafts, ski poles, tennis rackets, bicycle frames, and the like.

[0002]

2. Description of the Related Art Conventionally, in the case of polishing the surface of a tubular body material reinforced with reinforcing fibers using a resin as a matrix, a method of directly rubbing a support body holding abrasive particles on the surface of the material such as sanding or buffing. It has been known. In the method of directly rubbing the holding body, the reinforcing fibers are ground or cut, and the significance of the reinforcing fibers as a reinforcing member for reinforcing the resin of the tubular body material is diminished. Therefore, JP-A-6-327380 is disclosed. Then, make the abrasive particles fluid by vibration or finish the surface of the rod material by blasting, bury the reinforcing fibers on the surface of the rod material in the lower half of its cross section in the resin, and expose the upper half. It is disclosed that the resin is dug down from the surface of the reinforcing fiber.

[0003]

However, scraping off the embedding resin that performs the bonding action between the reinforcing fibers in this way reduces the bonding force between the fibers and, in turn, the strength of the rod tube. Also, even though it is said that the reinforcing fibers on the surface, the height position of them is not constant, and since the fiber diameter is extremely fine about a few microns, most of the reinforcing fibers on the surface of the rod tube are When the surface is processed so as to be exposed as described above, in reality, a large amount of reinforcing fibers completely lifted from the resin layer are generated. In such a fluffy state, the rod tube strength is further reduced. Regarding the adhesion with epoxy resin-based or urethane resin-based coatings, the adhesion with the resin such as epoxy used in the prepreg is better than the adhesion with the reinforcing fiber whose surface is exposed by polishing. It is excellent, and the structure disclosed in the above publication does not necessarily improve the adhesion of the coating film.

Therefore, an object of the present invention is to provide a lightweight and high-strength surface morphology for various tubular bodies including a rod tube which receives a large bending deformation and a large bending force and a crushing force. Another object is to provide a surface morphology that improves the adhesion of the coating film.

[0005]

SUMMARY OF THE INVENTION In view of the above object, the present invention allows the resin on the surface of the tubular body main body formed by firing a prepreg obtained by impregnating or mixing resin into the reinforcing fiber to hardly expose the reinforcing fiber. Provided is a tubular body, which is characterized by being covered with an ultrathin film and having a region in which the film-like resin surface is formed into a finely rough surface. Having a region means that the entire surface of the tubular body is preferably formed as described above, but it may be formed only in a region where strength is particularly required or in other regions. In addition, the resin between the reinforcing fibers near the surface of the tubular body is a tubular body that is dug below the line connecting the tops of the reinforcing fibers.

[0006]

In the former case, since the reinforcing fibers are barely exposed on the surface of the tubular body and are buried in the resin, the bonding between the reinforcing fibers is strong and the strength of the tubular body is high. Also, even though the resin covers the surface, it covers the surface very thinly, so that the useless surface resin of the tubular body material is almost removed,
It becomes a lightweight tubular body. Furthermore, since the surface is covered with a resin, although it is not a reinforcing fiber but is extremely thin, it has a high adhesion to the coating film when the surface of this body is coated, and the resin surface Since it is in a finely roughened state, the adhesion with the coating film is further improved and the component adhesion is further improved. In the latter case, in addition to the above action, since the reinforcing fibers near the surface become a tubular body having a surface in which the resin between the reinforcing fibers is dug down while leaving a thin resin film around it, the bonding force between the reinforcing fibers is maintained. Further reduction in weight is achieved. In addition, during coating, the surface of the tubular body becomes deeper as compared with the above-mentioned fine rough surface, so that the adhesion with the coating film is further improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on the embodiments shown in the accompanying drawings. FIG. 1 shows a raw material 10 after heat-molding a fishing rod tube as an example of a tubular body according to the present invention.
That is, a prepreg obtained by impregnating a reinforcing fiber bundle such as carbon fiber, alumina fiber, aramid fiber or the like or a woven cloth with a thermosetting resin such as an epoxy resin or mixing a thermoplastic resin fiber such as polyamide with a core metal It is a rod tube material 10 which is wound around and is heat-molded while being pressed by being tightened with a tightening tape, and the tightening tape and the core metal are removed. In this embodiment, the rod tube material is formed into a three-layer structure, and the inner layer 10A in which the reinforcing fibers are mainly oriented in the circumferential direction and the intermediate layer in which the reinforcing fibers are mainly oriented in the longitudinal direction of the rod tube. 1
0B and the outer layer 10C in which the reinforcing fibers are mainly oriented in the circumferential direction. The tightening tape mark 12 remains on the outer surface.

Excess resin on the surface of the rod tube material 10 is removed to reduce the weight of the rod tube to a reasonable weight, and a surface treatment is applied for subsequent painting to give the surface fine irregularities. The rough surface is formed. Therefore, a liquid honing process is performed in which fine abrasive particles are mixed in a liquid (water or oil), and the liquid in which the abrasive particles are mixed is blown onto the surface of the rod tube material by, for example, compressed air of ^{2 to} 6 kg / cm ² . Alumina, glass beads, other metals or ceramics can be used as the material of the abrasive particles, and a natural material may be used. It is preferable that the size of the abrasive particles is larger than the diameter of the reinforcing fibers because it is difficult to expose the reinforcing fibers buried in the resin, but if the size is small, it is suitable when the resin between the reinforcing fibers is dug down as in claim 2. . The polishing time, the above pressure and the like are adjusted appropriately. Further, from the viewpoint of not damaging the reinforcing fibers, it is preferable to use particles having no edges, such as spherical and elliptical shapes as the abrasive particles.

FIG. 2 shows an enlarged view of the state in which the surface of the rod tube material is polished in this way. The stepped line indicated by the chain double-dashed line 14 on the outer peripheral surface of the rod tube is a trace of the prepreg wound around the cored bar, the cellophane tape or polyester tape being polymerized and wound around the cored bar, heat-cured, and then removed. In this state, which is the surface of the rod tube material 10 before polishing, the resin on the surface is polished and removed to form a solid line surface. FIG. 3 is an enlarged view of the portion A of the polished surface, and the arrangement of the reinforcing fibers 16 is schematically shown in FIG. 3. According to this, the reinforcing fibers in the outermost layer are shown. 16 are buried in the resin 18, and the surface of the reinforcing fibers 16 is covered with an ultrathin resin coating,
Furthermore, the resin coating surface 20 has irregularities. That is, according to the liquid honing process, the surface of the reinforcing fibers 16 is not exposed as shown in FIG. 6 described later, and the resin surface is roughened while being embedded in a thin resin film. You can According to the experiment, as shown in FIG. 3, most of the reinforcing fibers are not exposed, but some upper surfaces of the reinforcing fibers whose fiber directions are disturbed may be exposed. However, the state is obviously different from the case of FIG.

FIG. 4 is an enlarged view of the portion B of FIG. 2, and as described above, the step portion of the chain double-dashed line 14 is the winding pitch trace of the tightening tape. The actual arrangement state of the reinforcing fibers 16 thus varies in the vertical direction. However, unlike the case of FIG. 6, the reinforcing fibers 16 are barely exposed, and the resin on the surface can be polished and removed to such an extent that their surface is covered with the uneven coating film of the resin. 4 is different from FIG. 3 for explaining the invention, and also shows a state in which the resin between the reinforcing fibers corresponding to claim 2 is dug down. That is, the resin between adjacent reinforcing fibers is often dug down from the line that virtually connects the tops of the reinforcing fibers, which contributes to the weight reduction, and the adhesive strength during coating. improves. It should be noted that only the outermost layer of the reinforcing fiber 16 in FIG. 4 is shown, and the others are omitted. The rod tube polished in this way is light in weight by removing excess resin on the surface, but since the reinforcing fibers 16 are buried in the resin, the connection between the reinforcing fibers remains strong, so the rod tube strength is strong. Therefore, the operability of the fishing rod is improved. Furthermore, when this surface is coated, the coating film has good adhesion to the rough resin surface 20 having irregularities,
It is difficult to peel off even if it is repeatedly subjected to large bending deformation. From the smoothness of the surface of the tubular body and the uniform adhesion of the coating film,
It is not preferable that the surface irregularities have edges such as saw teeth, and smooth irregularities of several microns or less are preferable.

On the other hand, FIG. 5 is a view showing the polishing state by the sander polishing described above (the surface irregularities are not shown), and the reinforcing fibers 16 in the outermost layer are scraped off, so that the rod tube etc. As a result, the strength decreases. In this case, since the reinforcing fibers are oriented in the circumferential direction, the crushing strength of the rod tube is mainly reduced, but if it is oriented in the longitudinal direction of the fishing rod, the bending strength is reduced. FIG. 6 shows the above-mentioned Japanese Patent Laid-Open No. 6-32738.
It is a figure which shows the grinding | polishing state disclosed by the 0 gazette, and in this case, about the upper half of the reinforcing fiber 16 of the outermost layer is exposed,
This is because the reinforcing fibers are weakly bonded to each other as compared with the state of being embedded in the resin as in the present invention, and the rod tube strength is reduced accordingly. Further, the adhesiveness between the paint and the fiber is inferior to the adhesiveness between the paint and the resin, and therefore the adhesive force of the coating film is also improved in the present invention.

If an epoxy resin is used for the rod body, the use of epoxy paint or urethane paint as the paint contributes to the improvement of adhesion. Further, since the surface of the tubular body has fine irregularities, the adhesion is improved even if a rubber-based paint or a paint containing fluorine particles is used due to the effect of increasing the adhesion area. In the above, the tubular body surface is mainly composed of reinforcing fibers oriented in the circumferential direction, but when mainly composed of reinforcing fibers oriented in the longitudinal direction of the tubular body or when woven fabric-like reinforcing fibers are arranged on the surface. But the same is true.

[0013]

As is apparent from the above description, according to the present invention, since the reinforcing fibers are barely exposed on the surface of the tubular body and are buried in the resin, the bonding between the reinforcing fibers is strong, The strength of the tubular body is high. Further, even though the resin covers the surface, it covers the surface in an extremely thin state, so that the useless surface resin of the tubular body material is almost removed, and a lightweight tubular body is obtained. Therefore, a tubular body with good operability can be provided. In addition, since the surface of the tubular body is coated with resin, which is extremely thin but not with reinforcing fibers, fluffing and rising of the reinforcing fibers are prevented, and water is removed from the interface between the reinforcing fibers and the resin. It is possible to prevent defects such as deterioration of durability due to permeation of water and to provide a high-quality tubular body.
Further, when the surface of the main body is coated, most of the surface is resin, and the coating material and the coating material come into contact with each other, so that the adhesiveness with the coating film is high. In addition, because the resin surface is in a finely roughened state, the adhesion with the coating film is further improved, peeling of the paint can be prevented, durability is excellent, and the adhesiveness of parts is improved due to the roughened state. Become a body. Furthermore, if the resin between the reinforcing fibers is dug down while leaving a thin resin around the reinforcing fibers on the surface, it is possible to further reduce the weight, and since the tubular body surface has deeper unevenness during coating, Adhesion is improved.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an essential part of a fishing rod according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of FIG.

FIG. 3 is an enlarged view of a portion A of FIG.

FIG. 4 is an enlarged view of part B of FIG.

FIG. 5 is a diagram showing a state formed by conventional surface polishing.

FIG. 6 is a diagram showing a state formed by another conventional surface polishing.

[Explanation of symbols]

 10C Tubular body outer layer 16 Reinforcing fiber 18 Resin 20 Resin coating surface

Claims (2)

[Claims] 1. A resin on the surface of a tubular body formed by firing a prepreg in which reinforcing fibers are impregnated with or mixed with a resin is made to be in a state of being covered with an ultrathin film without exposing the reinforcing fibers. A tubular body having a region in which a film-like resin surface is formed in a finely rough state. 2. The tubular body according to claim 1, wherein the resin between the reinforcing fibers near the surface of the tubular body is dug below the line connecting the tops of the reinforcing fibers.